Question

Question #f67de

Answer 1

`t=16:10`.

Explanation:

The train leaves every `5/2` hours. Let the current time be `t`. Note that `40` minutes is `2/3` of an hour.

`40` minutes ago, the train left. So we know at `t-2/3`, the train left.

We also know that in two and a half hours, it'll be `18:00` and the next train will leave.

So `(t-2/3)+5/2=18`.

Solve to get `t=16 1/6` hours, or `t=16:10`.